845GL datasheet(148/193 Pages) INTEL

148 / 193 page

Electrical Characteristics

148

Intel® 82845G/82845GL/82845GV GMCH Datasheet

6.3

Power Characteristics

NOTES:

1. See Intel® 845G/845GL/845GV Chipset: Intel® 82845G/82845GL/82845GV Graphics and Memory Controller

Hub (GMCH) Thermal and Mechanical Design Guidelines

for more information.

2. These current levels may happen simultaneously and can be summed into one supply.

6.4

Signal Groups

The signal description includes the type of buffer used for the particular signal (see Table 6-4):

AGTL+

Open Drain AGTL+ interface signal. Refer to the AGTL+ I/O Specification

for complete details. The GMCH integrates most AGTL+ termination

resistors.

AGP

AGP interface signals. These signals are compatible with AGP 2.0 1.5 V

Signaling Environment DC and AC Specifications. The buffers are not 3.3 V

tolerant. (DVO signals use the same buffers as AGP)

HI CMOS

Hub Interface 1.5 V CMOS buffers.

DDR CMOS

DDR System memory 2.5 V CMOS buffers.

SDR CMOS

SDR System memory 3.3 V CMOS buffers.

Table 6-3. Power Characteristics

Symbol

Parameter

Max

Unit

Notes

PGMCH(DDR)

Thermal Design Power

PGMCH(SDR)

Thermal Design Power

IVCC(DDR)

1.5 V Core Supply Current

2.46

IVCC(SDR)

1.5 V Core Supply Current

2.0

IVCCAGP

1.5 V AGP Supply Current (AGP mode)

0.37

IVCCAGP

1.5 V AGP Supply Current (DVO mode)

0.18

IVCCHI

1.5 V Hub Interface Supply Current

IVTTFSB

GMCH VTT supply Current

2.4

IVCCSM(DDR)

DDR System Memory Interface (2.5 V) Supply Current

2.2

ISUS_2.5

2.5 V Standby Supply Current

IVCCSM(SDR)

SDR System Memory Interface (3.3 V) Supply Current

1.6

ISUS_3.3

3.3 V Standby Supply Current

Table 6-4. Signal Groups (Sheet 1 of 2)

Signal

Group

Signal Type

Signals

AGP Interface Signal Groups

(a)

AGP I/O

GADSTB_[1:0], GADSTB_[1:0]#, GFRAME#, GIRDY#, GTRDY#,

GSTOP#, GDEVSEL#, GAD_[31:0], GC/BE_[3:0]#, GPAR

(b)

AGP Input

GPIPE#, GSBA_[7:0], GRBF#, GWBF#, GSBSTB, GSBSTB#, GREQ#

(c)

AGP Output

GST_[2:0], GGNT#

(d)

AGP Miscellaneous

AGP_VREF, AGP_RCOMP

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